Author: Joyce Laird, contributing editor
Why do we need thin surface ball bearings?
The development of thin surface ball bearings is to solve the incompatibility problem of standard deep groove ball bearings. John A. Wallace, vice president of operations at AST Bearings LLC, explained that classic applications are those that have space constraints, weight issues, and load and torque requirements that still require the use of ball bearings. "There are many definitions in the industry. One of the more common is that when the bore diameter is more than 4 times larger than the radial cross section, the bearing is considered to be a thin section. The cross section size may vary, but it is generally two times the diameter of the ball. Times."
"There are many configurations for thin surfaces: radial, angular contact, 4-point contact, full complementarity, duplex pairs and different cross-sections," Xiaolaidds added. "The choice of a particular configuration usually depends on the type and size of the load required by the application."
How do you choose better thin-surface bearings for your application?
AST thin flange super duplex
This is AST thin flange super double bearing
Wallace said that although the typical bearing selection process can be used for thin-face bearings, space requirements will urge designers to look at the options in the thin-section bearing series. "Next, the load and operating conditions will determine the most suitable type of thin-section ball bearing, namely radial, angular contact, double pair, 4-point contact, etc. After considering the maximum static and dynamic load, the required bearing life , And catalog data-for size, speed and load rating, the final type, size and bearing arrangement can be selected."
"Of course, other application inputs must be considered. These include working environment, rotational performance, installation conditions, and temperature to determine bearing specifications. The accuracy level, clearance, lubricant, and closure type (shield or seal) are also specified for the correct bearing a big part."
Familiar with the importance of thin-surface bearing types
Once the application details such as space, load, and other operating conditions are determined, the next thing to consider is the type of thin-face bearing to be used.
"When the load is mainly in the radial direction, use radial bearings," Xiaolaidds said. "They can also support limited axial and reverse loads. For this type, standard series bearings are usually the best choice."
"When thrust and axial loads are high, use the angular contact type," he added. "These types of bearings can provide higher load capacity and rigidity, as well as high rotation accuracy when used as a double (matching group)."
Continue to use 4-point contact bearings, which have a unique raceway design that allows one bearing to handle radial, thrust and turning moment loads. "Looking at the cross section, the raceway has the shape of a Gothic arch, not a true radius," Xiaolaidds explained. "This arch forms 4 points of contact with the balls and raceways. Designers can choose a 4-point contact bearing configuration instead of two angular contact bearings. This saves space and weight."
Xiaolaidds pointed out that many thin-surface ball bearing applications have functional requirements that allow them to be used in the broadest sense of "instrument". "These applications usually have strict requirements on rotation accuracy, repeatability and torque. The tolerances of instrument bearings are generally equal to ABEC 5 or 5T, or higher."
"Thin-face bearings are usually available in 52100 chrome steel and martensitic stainless steel for use when corrosion is a concern. Different sealing options are provided to prevent contamination. Various accuracy levels can reach up to ABEC 5T or 7F. Yes. Different ball separators are available for non-standard operating conditions. All these factors must be considered when specifying."
Special installation requirements for AST thin-walled bearings
"Precision thin-section ball bearings should be assembled in clean workstations. Tools and mating parts should also be clean, free of burrs, dirt, debris, etc.," Xiaolaidds said. "It is a good practice to store the bearings in the original factory packaging before installation."
"The interference fit must be very careful not to damage the bearing. Hot fittings can be used to minimize the installation force. The pressing tool should be in 360-degree contact with the ring being pressed. Never transfer force to the ring through the ball. Push the ring with an interference fit Finally, always observe the matching marks when installing the double bearing to ensure correct orientation."
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